Extract Even Bits Only from 32-bit Register

#include <stdio.h>
#include <stdint.h>

uint32_t extract_even_bits(uint32_t reg) {
    // Your code her
    uint16_t extractval = 0;
    uint8_t index=0;
    uint8_t targetindex = 0;
    for(index =0; index <32;index+=2)
    {
        if(reg & (1U<<index))
        {
            extractval |= 1<< targetindex;
        }
        targetindex++;
    } 
    return extractval;
}

int main() {
    uint32_t reg;
    scanf("%u", &reg);
    printf("%u", extract_even_bits(reg));
    return 0;
}